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. 2011 Aug 3;32(3):267–271. doi: 10.1007/s11239-011-0622-5

Table 1.

Mathematical functions for methods A, C, D, and E to reduce the differences compared to method B

Assay Method Equations versus method B r2
Coamatic A y = 0.2695x− 1.2234x2 + 2.1591x − 0.0379 0.9988
S2222 FXa C y = 3.239x− 4.0879x+ 1.9418x − 0.0724 0.9919
STA liquid anti Xa D y = −0.0583x− 0.1207x+ 1.2159x + 0.0147 0.9994
Technochrom E y = 1.0851x− 1.2646x+ 1.3108x − 0.0331 0.9986

This method was considered as provisional standard since it exposed the lowest difference sum compared to the mean OD concentration curve averaged from of all methods employed here